Lamp



FIG. 1 is a front elevational view of the lamp showing our new design, the light bulb and socket apparatus and pull chain shown in broken lines being for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a right side elevational view with the opposite side being a mirror image thereof, the light bulb and socket apparatus and pull chain shown in broken lines being for illustrative purposes only and form no part of the claimed design;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a lamp, as shown and described. 